/**
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.gettyio.core.handler.ipfilter;

import com.gettyio.core.channel.SocketChannel;
import com.gettyio.core.pipeline.in.ChannelInboundHandlerAdapter;

import java.io.IOException;
import java.net.SocketAddress;


/**
 * AbstractRemoteAddressFilter.java
 *
 * @description:抽象IP过滤器
 * @author:gogym
 * @date:2020/4/9
 * @copyright: Copyright by gettyio.com
 */
public abstract class AbstractRemoteAddressFilter<T extends SocketAddress> extends ChannelInboundHandlerAdapter {


    @Override
    public void channelAdded(SocketChannel socketChannel) throws Exception {
        super.channelAdded(socketChannel);
        handleNewChannel(socketChannel);
    }

    /**
     * 执行IP验证
     *
     * @return void
     * @params [aioChannel]
     */
    private void handleNewChannel(SocketChannel socketChannel) {
        try {
            T remoteAddress = (T) socketChannel.getRemoteAddress();
            if (remoteAddress == null) {
                socketChannel.close();
            }
            boolean flag = accept(socketChannel, remoteAddress);
            if (!flag) {
                socketChannel.close();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    /**
     * @param aioChannel    通道
     * @param remoteAddress 远程地址
     * @return Return true if connections from this IP address and port should be accepted. False otherwise.
     */
    protected abstract boolean accept(SocketChannel aioChannel, T remoteAddress);


}
